3,5-Diamino-2-[[4-(2-aminoethylperoxysulfanyl)-2-sulfophenyl]diazenyl]-4,6-bis[[2-methoxy-5-(2-sulfooxyethylsulfonyl)phenyl]diazenyl]benzoic acid;3,5-diamino-2-[[4-[2-(ethylamino)ethylperoxysulfanyl]phenyl]diazenyl]-4,6-bis[[4-(2-sulfooxyethylsulfonyl)phenyl]diazenyl]benzoic acid;3,5-diamino-2-[[4-[2-(2-hydroxyethylamino)ethylperoxysulfanyl]phenyl]diazenyl]-4,6-bis[[5-[[2-(methylidene-lambda3-bromanyl)acetyl]amino]-2-(trioxidanylsulfanyl)phenyl]diazenyl]benzoic acid;3,5-diamino-2-[[3-[2-(methylamino)ethylperoxysulfanyl]phenyl]diazenyl]-4,6-bis[[4-[2-(2-sulfooxyethylsulfonyl)ethylcarbamoyl]phenyl]diazenyl]benzoic acid;3,5-diamino-2-[[3-[2-(methylamino)ethylperoxysulfanyl]phenyl]diazenyl]-4,6-bis[[3-(2-sulfooxyethylsulfonyl)phenyl]diazenyl]benzoic acid